[jira] [Commented] (SCB-836) Support the nesting SagaStart

["Zheng Feng (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SCB-836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16669660#comment-16669660 ] 

Zheng Feng commented on SCB-836:
--------------------------------

NOTE from the spec of LRA
{noformat}
Note that there is no annotation to directly cancel a closed nested LRA and the Java LRAClient api must be used for this purpose if required.
{noformat}

So we need these client APIs to talk to the alpha server directly ?




> Support the nesting SagaStart
> -----------------------------
>
>                 Key: SCB-836
>                 URL: https://issues.apache.org/jira/browse/SCB-836
>             Project: Apache ServiceComb
>          Issue Type: Improvement
>          Components: Saga
>            Reporter: Willem Jiang
>            Priority: Major
>
> We can take the [nesting-lras|https://github.com/eclipse/microprofile-lra/blob/master/spec/src/main/asciidoc/microprofile-lra-spec.adoc#323-nesting-lras] from the microprofile as an example. 
> An activity can be scoped within an existing Saga using the @SagaStart annotation. Invoking a method marked with this annotation will start a new Saga whose outcome depends upon whether the enclosing Saga is closed or cancelled.
> * If the nested Saga is closed but the outer Saga is cancelled then the participants registered with the nested Saga will be told to compensate.
> * If the nested Saga is cancelled the outer Saga can be still closed.



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